Publication: Preservation of Permian–Triassic boundary section in the Jurassic accretionary complex of the Lake Hamana, Central Japan
Issued Date
2020-01-01
Resource Type
ISSN
10991034
00721050
00721050
DOI
Other identifier(s)
2-s2.0-85085704887
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Geological Journal. (2020)
Suggested Citation
Wang Ding, Kohtaro Ujiie, Katsuo Sashida Preservation of Permian–Triassic boundary section in the Jurassic accretionary complex of the Lake Hamana, Central Japan. Geological Journal. (2020). doi:10.1002/gj.3881 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/57868
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
Preservation of Permian–Triassic boundary section in the Jurassic accretionary complex of the Lake Hamana, Central Japan
Author(s)
Other Contributor(s)
Abstract
© 2020 John Wiley & Sons Ltd We examined the lithostratigraphy and deformation structures of the accreted pelagic rocks in Lake Hamana area, Central Japan, based on a detailed field mapping and the radiolarian ages. The constructed lithostratigraphy is composed of Lopingian (Upper Permian) grey chert, black chert, black claystone with a high carbon content of 4.85–6.78 wt%, siliceous claystone, black chert, and Anisian (Middle Triassic) grey chert, in the ascending order. The symmetry in the lithostratigraphy and the change in the radiolarian ages with respect to black carbonaceous claystone are presumed to represent a deep-sea anoxic event that occurred across the Permian–Triassic (P–Tr) boundary. The P–Tr boundary black carbonaceous claystone suffered from an intense shear, resulting in blocks of siliceous claystone in the scaly black claystone matrix. In places, the sheared terrigenous rocks composed of sandstone blocks in the mudstone matrix are intercalated into the pelagic rocks, possibly representing complex mélange forming processes during the development of the Jurassic accretionary complex.